@Book{BVMC:715985, author = {Ackermann, Rudolph}, title = {Carta de Rudolph Ackermann a José del Valle. Londres, 4 de octubre de 1826}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2015}, year = {2015}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmc9k673} }